Spraying device



J. W. BUSS SPRAYING DEVICE Sept. 4, 1951 Filed Jan. 2, 1948 INVENTOR.

John W Buss ATTORNEY.

Patented Sept. 4, 1951 UNITED STATES PATENT OFF SPRAYING DEVICE John W.Buss, Canton, Ohio, assignor to The Hoover Company, North Canton, Ohio,a corporation of Ohio Application January 2, 1948, Serial No. 259

3 Claims.

This invention relates to sprayers and similar devices, and moreparticularly to a means for controlling the operation of a sprayer orother device which is supplied with a continuous current of air. Thisinvention is an improvement over the air supply controlling means asdisclosed and claimed in the U. S. Patent 1,911,366 granted to W. H.Kitto et al. on May 30, 1933, and. which is assigned to a commonassignee, The Hoover Company, a corporation of Ohio.

One of the objects of the invention is to provide a sprayer which is ofrugged and simple construction and which can be economicallymanufactured.

A further object is to provide a device of the type which can beconveniently used, and in which the spraying action can be easily andeffectively controlled between wide limits and tendency to dribble willbe avoided. I

A still further object is the provision of simple and eflicient meansfor controlling the flow of air from a source of continuous supply to adevice of thi kind by which the air flow can be.

varied as desired without materially varying the back pressure upon theair supplying means.

Still further objects of the invention, as well as the novel features ofconstruction and operation will be understood upon a reading of thefollowing description of a preferred embodiment of the invention shownin the accompanying drawings, in which:

Figure 1 is a plan view of a sprayer partly in section embodying theinvention;

Figure 2 is a View in longitudinal section partly in side elevationtaken along line 22 of Figure 1, looking in the direction of the arrows;and

Figure 3 is a view in longitudinal section partly in side elevationtaken along the line 3-3 of Figure 1 looking in the direction of thearrows.

As shown the main body of the spraying device III is in the form of acover I I having an integrally molded internally threaded collar I2 tdetachably receive cooperating threads I4 on the top of a glass jar I3.On the top I Iis formed a tube I5 having a bore I6 and a. downwardlyopening recess M. -The bore I6 extends'rearwardly and is tapered at I!for detachable connection with a blower tube I'I connected'to the bloweroutlet of a suction cleaner. The cover I I, the tube I5, and thethreaded collar I2 are integrally molded from suitable thermoplasticmaterial.

A metal tube I8 is soldered at 24' in an opening 24 passing through ametal closure I9 positioned against the shoulder in a threaded collarI2. The closure I9 is attached to the shoulder in collar I2 by screws 20interfitting with threaded holes 2| in the cover II. A gasket 25 ispositioned between the closure I9 and the top edge of the jar I3. Thetube I8 is curved forwardly and tapered to form a sprayer-nozzle 22positioned centrally of an opening 23 in the forin the cover II.

ward end of the bore I6 and centered therein and its lower end extendsdownwardly to adjacent the front bottom corner of the jar I3 as shown inFig. 2. The downwardly opening recess 4I communicates with the interiorof the jar I3 by means of a restricted orifice 26 formed in the closureI9. I

To one side of the tube I5 the cover II is provided with a recess forreceiving a metal insert 42 having a lower valve orifice 28 and athreaded opening 23 for receiving the threads of a control valve 21knurled at 3| and tapered at its lower end at 30 to cooperate with theorifice 28. Communicating with the orifice 28 is a side opening 43 inthe insert 42 which in turn communicates with the outside atmosphere byan opening 29 The orifice 28 communicates with a recess 34 formed in thelower face of the cover II which in turn communicates with the interiorof the jar I3 through an opening 36 extending through the closure I9below the recess 34.

The-closure I9 is provided with an opening 40 in which is riveted avertically extending tube 39 extending upwardly through the recess 4|and bore I6 and tightly fitting into a bore 38 through the top wall ofthe tube I5. A top opening 31 of the bore 38, in conjunction with theoperator's thumb, forms a valve as will presently appear. In assemblingthe device the tube I8 is soldered to the closure I9 and the tube 39riveted thereto. Those parts thus form a unitary replacement assembly tobe detachably secured in the threaded collar I2 by the screws 20.

Operation The jar I3 is filled with paint or other fluid to be sprayed,the cover II replaced, the blower fitting II inserted in the taperedopening I! of the tube I5 and the cleaner or other source of airpressure energized.

Air will pass through the bore I6 and through the opening 23 but nofluid will be forced upwardly in the tube I8 because the interior of thejar I3 is opened to atmosphere through the tube 39. When it is desiredto spray paint or other fluid, the thumb of the operator is placed overthe opening 31 to entirely close that opening. At that time the pressureover the liquid in the jar I3 will be that of the static pressure in thebore I6, atmospheric, or some pressure between the two depending uponthe setting of the control valve 21.

If a heavy spray of liquid is desired the valve 21 is operated to movethe tapered end 39 in a direction to close the orifice 28. If a lighterspray is desired the valve 21 is rotated in a direction to open theorifice 28. p

The raised pressure over the liquid in the jar I5 will cause the liquidto rise in the tube I8 and be projected through the atomizing nozzle'22. Air under pressure leaving the bore I3 through the opening 23 willaid in atomizing the liquid leaving the nozzle 22 and will also aid inthe flow of liquid through the tube [8 by its aspirating effect.

The use of the needle valve 21 has particular utility in the type ofsprayer to which this invention relates so that the operator need not becareful with regard to the extent the opening 31 is closed but maycompletely close that opening with his thumb whenever it is desired touse the sprayer. The quantity of liquid ejected through the nozzle 22 isnicely adjusted by the needle valve 21 regardless of the viscosity orthinness of the liquid beingsprayed.

In, prior art. Sprayers of the general type herein disclosed it wasnecessary for the operator to be quite skilled since the amount ofclosing of thegthumb: opening changed with the thickness of the spraydesired as well as with the viscosity or thinness of the liquid beingsprayed.

While a preferred embodiment of the invention in a spraying device hasbeen shown and described, it. will be understood that variations It isalso to be "downwardly from said cover and having a shouldered recessfor detachably receiving the open end of said container, said recessbeing in open communication with a bore extending longitudinally of saidcover above said recess, an integral extension on said cover extendingrearwardly thereof and including an extension of said bore, saidextension being formed for detachable connection with a fitting forleading air under pressure to said bore, said cover having a retrictedopening forming a continuation of said bore centrally thereof at theforward end thereof whereby a static pressure is produced in said boreby the flow of air under pressure therethrough, said cover having adownwardly opening recess to one side of said bore in open communicationwith said therefrom may be made without departing from I the scope ofthe invention. understood that the. invention may be applied shoulderedrecess, said cover having a vent op'ening between said downwardlyopening recess and the atmosphere, a closure detachably secured againstthe shoulder of said shouldered recess and closing off communicationbetween said downwardly opening recess and said bore and said shoulderedrecess, said closure having restricted openings therethrough below saiddownwardly opening recess and below said bore for connecting them withsaid shouldered recess, a valve for restricting air flow through saidvent opening, a liquid tube permanently carried by said closure andhaving one end extending downwardly into said container and its otherend extending upwardly and forwardly to the center of said forwardlyextending restricted opening and a control tube permanently-carried bysaid closure connecting said shouldered recess to atmospheric pressurewhereby the interior of said container may be selectively subjected toatmospheric pressure or to a static pressure in said bore, the value ofwhich is governed by the setting of said valve.

2. A spray head comprising an integrally mold- 4 ed-plastic-body and apermanently assembled accessory for detachable assembly to said body;said body including a downwardly extending annular collar for detachablyreceiving the open top of a liquid receiving container and having adownwardly facing. shoulder interiorly thereof and a horizontallyextending tube interiorly connected with the interior of said collar,said tube including an open. ended rearward extension for detachablyreceiving the end of the tube connectedto a source of air under pressureand a forward extension having a restricted central opening, said tubebeing provided with. an opening in its upper wall above said-collar;said accessorycomprising a metallic plate; lying. within said collaragainst. said shoulder, a vertically rising liquid tube passing throughsaid plate. and

welded thereto and having, a nozzle extending forwardly into therestricted opening in the forwardextension of said body and a verticalair control' tube having its lower end permanently secured to said plateand its open upper end extending upwardly into the openingin the. upperwall ofthe horizontally extending tube of said body; said accessorybeing provided with a vent opening connecting the interior of thehorizontally extending tube and collar of said body.

3; A spray head comprising a molded plastic body I'll and a permanentlyassembled accessory for detachable assembly with the body In; saidaccessory consisting of an annular metallic'cover plate la, a metallicsmall diameter tube 18 extending through an opening inand permanentlysecured to the plate 19, one end of tube I8 extending substantiallyperpendicularly from one side of the plate l9 and its other endextending from the other side of plate l9 in substantially an arc ofacircle and having a restricted nozzle 22 extending beyond the edge ofplate i8 and a the collar f2, having its interior in communication withthe interior of the collar 12', having a bore I1 at one end to receive atube connected to a source of air under pressure, having a restrictedopening 23. at its other end and having an opening '37 in its top wallopposite the collar [2 of a size to snugly receive the end of tube 39;the arrangement being such that when said accessory is assembled withthe body 10, the plate [9 will rest against the shoulder of collar '2,the nozzle 2'2 of tube I8 will be positioned centrally of opening 23 andthe end of tube 39 will be positioned in opening 31.

JOHN W. Buss.

REFERENCES CITED The following references are of record in the file ofthis patents UNITED STATES PATENTS Number I

